1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include <network_helpers.h> 4 #include <linux/netfilter/nf_conntrack_common.h> 5 #include "test_bpf_nf.skel.h" 6 #include "test_bpf_nf_fail.skel.h" 7 8 static char log_buf[1024 * 1024]; 9 10 struct { 11 const char *prog_name; 12 const char *err_msg; 13 } test_bpf_nf_fail_tests[] = { 14 { "alloc_release", "kernel function bpf_ct_release args#0 expected pointer to STRUCT nf_conn but" }, 15 { "insert_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, 16 { "lookup_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, 17 { "set_timeout_after_insert", "kernel function bpf_ct_set_timeout args#0 expected pointer to STRUCT nf_conn___init but" }, 18 { "set_status_after_insert", "kernel function bpf_ct_set_status args#0 expected pointer to STRUCT nf_conn___init but" }, 19 { "change_timeout_after_alloc", "kernel function bpf_ct_change_timeout args#0 expected pointer to STRUCT nf_conn but" }, 20 { "change_status_after_alloc", "kernel function bpf_ct_change_status args#0 expected pointer to STRUCT nf_conn but" }, 21 { "write_not_allowlisted_field", "no write support to nf_conn at off" }, 22 }; 23 24 enum { 25 TEST_XDP, 26 TEST_TC_BPF, 27 }; 28 29 #define TIMEOUT_MS 3000 30 #define IPS_STATUS_MASK (IPS_CONFIRMED | IPS_SEEN_REPLY | \ 31 IPS_SRC_NAT_DONE | IPS_DST_NAT_DONE | \ 32 IPS_SRC_NAT | IPS_DST_NAT) 33 34 static int connect_to_server(int srv_fd) 35 { 36 int fd = -1; 37 38 fd = socket(AF_INET, SOCK_STREAM, 0); 39 if (!ASSERT_GE(fd, 0, "socket")) 40 goto out; 41 42 if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) { 43 close(fd); 44 fd = -1; 45 } 46 out: 47 return fd; 48 } 49 50 static void test_bpf_nf_ct(int mode) 51 { 52 const char *iptables = "iptables-legacy -t raw %s PREROUTING -j CONNMARK --set-mark 42/0"; 53 int srv_fd = -1, client_fd = -1, srv_client_fd = -1; 54 struct sockaddr_in peer_addr = {}; 55 struct test_bpf_nf *skel; 56 int prog_fd, err; 57 socklen_t len; 58 u16 srv_port; 59 char cmd[128]; 60 LIBBPF_OPTS(bpf_test_run_opts, topts, 61 .data_in = &pkt_v4, 62 .data_size_in = sizeof(pkt_v4), 63 .repeat = 1, 64 ); 65 66 if (SYS_NOFAIL("iptables-legacy --version")) { 67 fprintf(stdout, "Missing required iptables-legacy tool\n"); 68 test__skip(); 69 return; 70 } 71 72 skel = test_bpf_nf__open_and_load(); 73 if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load")) 74 return; 75 76 /* Enable connection tracking */ 77 snprintf(cmd, sizeof(cmd), iptables, "-A"); 78 if (!ASSERT_OK(system(cmd), cmd)) 79 goto end; 80 81 srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", 0, TIMEOUT_MS); 82 if (!ASSERT_GE(srv_fd, 0, "start_server")) 83 goto end; 84 85 srv_port = get_socket_local_port(srv_fd); 86 if (!ASSERT_GE(srv_port, 0, "get_sock_local_port")) 87 goto end; 88 89 client_fd = connect_to_server(srv_fd); 90 if (!ASSERT_GE(client_fd, 0, "connect_to_server")) 91 goto end; 92 93 len = sizeof(peer_addr); 94 srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len); 95 if (!ASSERT_GE(srv_client_fd, 0, "accept")) 96 goto end; 97 if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len")) 98 goto end; 99 100 skel->bss->saddr = peer_addr.sin_addr.s_addr; 101 skel->bss->sport = peer_addr.sin_port; 102 skel->bss->daddr = peer_addr.sin_addr.s_addr; 103 skel->bss->dport = srv_port; 104 105 if (mode == TEST_XDP) 106 prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test); 107 else 108 prog_fd = bpf_program__fd(skel->progs.nf_skb_ct_test); 109 110 err = bpf_prog_test_run_opts(prog_fd, &topts); 111 if (!ASSERT_OK(err, "bpf_prog_test_run")) 112 goto end; 113 114 ASSERT_EQ(skel->bss->test_einval_bpf_tuple, -EINVAL, "Test EINVAL for NULL bpf_tuple"); 115 ASSERT_EQ(skel->bss->test_einval_reserved, -EINVAL, "Test EINVAL for reserved not set to 0"); 116 ASSERT_EQ(skel->bss->test_einval_reserved_new, -EINVAL, "Test EINVAL for reserved in new struct not set to 0"); 117 ASSERT_EQ(skel->bss->test_einval_netns_id, -EINVAL, "Test EINVAL for netns_id < -1"); 118 ASSERT_EQ(skel->bss->test_einval_len_opts, -EINVAL, "Test EINVAL for len__opts != NF_BPF_CT_OPTS_SZ"); 119 ASSERT_EQ(skel->bss->test_eproto_l4proto, -EPROTO, "Test EPROTO for l4proto != TCP or UDP"); 120 ASSERT_EQ(skel->bss->test_enonet_netns_id, -ENONET, "Test ENONET for bad but valid netns_id"); 121 ASSERT_EQ(skel->bss->test_enoent_lookup, -ENOENT, "Test ENOENT for failed lookup"); 122 ASSERT_EQ(skel->bss->test_eafnosupport, -EAFNOSUPPORT, "Test EAFNOSUPPORT for invalid len__tuple"); 123 ASSERT_EQ(skel->data->test_alloc_entry, 0, "Test for alloc new entry"); 124 ASSERT_EQ(skel->data->test_insert_entry, 0, "Test for insert new entry"); 125 ASSERT_EQ(skel->data->test_succ_lookup, 0, "Test for successful lookup"); 126 /* allow some tolerance for test_delta_timeout value to avoid races. */ 127 ASSERT_GT(skel->bss->test_delta_timeout, 8, "Test for min ct timeout update"); 128 ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update"); 129 ASSERT_EQ(skel->bss->test_insert_lookup_mark, 77, "Test for insert and lookup mark value"); 130 ASSERT_EQ(skel->bss->test_status, IPS_STATUS_MASK, "Test for ct status update "); 131 ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup"); 132 ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark"); 133 ASSERT_EQ(skel->data->test_snat_addr, 0, "Test for source natting"); 134 ASSERT_EQ(skel->data->test_dnat_addr, 0, "Test for destination natting"); 135 ASSERT_EQ(skel->data->test_ct_zone_id_alloc_entry, 0, "Test for alloc new entry in specified ct zone"); 136 ASSERT_EQ(skel->data->test_ct_zone_id_insert_entry, 0, "Test for insert new entry in specified ct zone"); 137 ASSERT_EQ(skel->data->test_ct_zone_id_succ_lookup, 0, "Test for successful lookup in specified ct_zone"); 138 ASSERT_EQ(skel->bss->test_ct_zone_dir_enoent_lookup, -ENOENT, "Test ENOENT for lookup with wrong ct zone dir"); 139 ASSERT_EQ(skel->bss->test_ct_zone_id_enoent_lookup, -ENOENT, "Test ENOENT for lookup in wrong ct zone"); 140 141 end: 142 if (client_fd != -1) 143 close(client_fd); 144 if (srv_client_fd != -1) 145 close(srv_client_fd); 146 if (srv_fd != -1) 147 close(srv_fd); 148 149 snprintf(cmd, sizeof(cmd), iptables, "-D"); 150 system(cmd); 151 test_bpf_nf__destroy(skel); 152 } 153 154 static void test_bpf_nf_ct_fail(const char *prog_name, const char *err_msg) 155 { 156 LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf, 157 .kernel_log_size = sizeof(log_buf), 158 .kernel_log_level = 1); 159 struct test_bpf_nf_fail *skel; 160 struct bpf_program *prog; 161 int ret; 162 163 skel = test_bpf_nf_fail__open_opts(&opts); 164 if (!ASSERT_OK_PTR(skel, "test_bpf_nf_fail__open")) 165 return; 166 167 prog = bpf_object__find_program_by_name(skel->obj, prog_name); 168 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) 169 goto end; 170 171 bpf_program__set_autoload(prog, true); 172 173 ret = test_bpf_nf_fail__load(skel); 174 if (!ASSERT_ERR(ret, "test_bpf_nf_fail__load must fail")) 175 goto end; 176 177 if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) { 178 fprintf(stderr, "Expected: %s\n", err_msg); 179 fprintf(stderr, "Verifier: %s\n", log_buf); 180 } 181 182 end: 183 test_bpf_nf_fail__destroy(skel); 184 } 185 186 void test_bpf_nf(void) 187 { 188 int i; 189 if (test__start_subtest("xdp-ct")) 190 test_bpf_nf_ct(TEST_XDP); 191 if (test__start_subtest("tc-bpf-ct")) 192 test_bpf_nf_ct(TEST_TC_BPF); 193 for (i = 0; i < ARRAY_SIZE(test_bpf_nf_fail_tests); i++) { 194 if (test__start_subtest(test_bpf_nf_fail_tests[i].prog_name)) 195 test_bpf_nf_ct_fail(test_bpf_nf_fail_tests[i].prog_name, 196 test_bpf_nf_fail_tests[i].err_msg); 197 } 198 } 199